Printing machine



FIG. 1 is a front, top and left side perspective view of a printing machine showing our new design;

FIG. 2 is a left side perspective view thereof;

FIG. 3 is a front perspective view thereof;

FIG. 4 is a right side perspective view thereof;

FIG. 5 is a top perspective view thereof; and

FIG. 6 is a rear perspective view thereof. 

The ornamental design for a printing machine, as shown. 